Another addition to zorroswordsman at gmail dot com's resize class. 

The function takes $_FILES['sent_image'] as 1st parameter. The 2nd is complete destination path. 

It only moves images. 

It returns destination path if succeeded, and false if any error occurred. 

<?php
public function move_image($tmp_img, $dest_img)
{
    //verifies if the uploaded file is an image
    if (strpos($tmp_img['type'], 'image') !== false) 
        {
        //moves the uploaded file into the destination place
        if (move_uploaded_file($tmp_img['tmp_name'], $dest_img)) {
            return $dest_img;
        }
    }        
    return false;
}
?>